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发明名称
Verfahren und Vorrichtung zur Herstellung von Gebirgsbohrungen,insbesondere Schaechten im Bergbau
摘要
申请公布号
DE1583804(A1)
申请公布日期
1970.09.24
申请号
DE19681583804
申请日期
1968.02.19
申请人
SOEDING & HALBACH EDELSTAHLWERKE
发明人
GUENTHER BECHEM,KARL
分类号
E21B4/18
主分类号
E21B4/18
代理机构
代理人
主权项
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